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In humans, color-blindness (Xn) is sex-linked and recessive to normal vision (XN). A color-blind man has...

In humans, color-blindness (Xn) is sex-linked and recessive to normal vision (XN). A color-blind man has several children with a woman who does not carry a gene for color-blindness.

(show punnet square)

  1. What proportion of this couple’s children could be color-blind?

  2. . What proportion of their daughters could be carriers of the gene? What proportion of their sons?

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